Lifting jack



Dec. 13, 1927,

A. C. HOPKINS LIFTING JACK 2 Sheets-Sheet 1 Filed April 21. 1926 IN VEN TOR. 47% 6. flap/ [725 .4 TTORNEY.

Dec. 13, 1927.

A. c. HOPKINS LIFIING JACK Filed April 21. 1926 2 Sheets-Shet 2 ATTORNEY.

Patented Dec. 13, 1927.

i v 1,652,406 'i UNlTED TAT-ES. O I 1 m us 6.

'norxnvs, or mxonreamassrenonro m'rrozmt STANDARD coM- i PANY, or NILES, mcmean, a; ooaronarroiv or mem LIE-TING .mex.

; Application fil ed Apri1-21, 1926.. JSerialNo.108,4f5.. V

The invention'irelates to lifting jacks and hasfor-itsobjeot-to provide a device of this character particularly adapted for use in connection: with the rear axles .of heavy motorbusses, and which axles, upon deflation of the tires, arerelatively close'to the ground, and the. axles a considerabledistance from; the rear end of the'body of the bus, and which conditions require. a lifting jack which is relatively low whereby its axle engaging member is. close to the ground so it can be moved under the. axle and thejack as a;wh0le relatively lorigwhereby itsflrear Y free end' of the endiwill extend to a position adjacent the rear end of the body of thebus so that the :jack can beleasily manipulated.

A :further object is to provide a lifting jack comprising a fixed frame, in which is mounted a pivoted .frame, the free end of which extends forwardly and terminates in an axle engaging member, an axially movable shaft carried by the fixed frame and operable from adjacent, the rear end of the jack, the forward end of the jack being provided-with means cooperating with the fixed frame'andthe' pivoted frameqwhereby upon axial'movement of the operating shaft, the

or: lowered. a

on an 'upward and downward movementof the free end of the pivoted frame the axle engaging member ismaintained'in a horizontal position. v a

A furtherob 'e'ct is to provide the axle engaging member with an upward and rear wardly extendingarm, to the rear end of which is pivotally connected a link, which link' has its other'end pivotallf connected-to the'fixe'd frame, and whichlin forms means whereby upon an upward or downward axially movable and pivotally mounted operating shaft, a transversely disposed member pivoted frame may bera'ised' Y of the invention. A further object is to provide the free end, of the pivotedframe with upwardly'and for- .wardly: inclined surfaces and the fixed frame with downwardlygand; forwardly inclined. surfaces, and the axially movable operating and the side bars of the pivoted frame with I upwardly and forwardly extending tracks ad acentithe tracks of the fixed frame, an

carriedby the forward end of the operating shaft and rollers carried by the ends of the transversely disposed member and engaging the .adqacenttracks ofthe fixed frame andwhereby, upon axial movement of the operating shaft said rollers will force the free end of ,the;;pivoted frame upwardly or allow the I the invention resides in the combination and arrangement of parts as hereinafter set forth, shown in the drawing, describedand claimed, it, being understood that changes may be made within the scope of what is claimed-without departing from the; spirit In the drawings Figure l'is a top plan view of the operating handle. and me'c -hanism. V r.

Fgure 3 is a vertical longitudinal sectionalview through the rear end ofthe jack.

Figure 4 is a vertical longitudinal section-al view through the jack, i v

Figure 5 is a vertical longitudinal sectional view throughthe jack, showing the axle engaging member partially raised.

Figure 6 is a vertical'transverse sectional View through the rear end of the jack taken on line 6-6 of Figure 1.

handle carried p'awls. V 7 Referring to the drawings, the numeral 1 "designates the fixed frame which is'horL zontallyldispo'sed and is relativel low and elongated, and, which frame comprises spaced 105 bars 2 in parallel relation, the forward ends of which are connected together by a shaft 3; The ends 4 of the shaft 3, extend beyond the outer sides of the bars 2 and 7 provided with. rollers 5. The rear ends of 110 the. pivoted frame, and forming means in the'precise embodiment of the invention,

Figure Qgisa top'plan View of a'portion of the rear ,endxof thefjack, showing the Figure 7 .is a detail view of the operating wardly adjacent *but spaced from the inner faces of the bars 2 of the fixed frame, and the forward ends of the bars 11 are connected together by means of a shaft 12. It will be seen the frame 10 may move upwardly and downwardly in relation to the forward end of the fixed frame 1 on the shaft 9 as a pivotalpoint andduringa jacking operationthe free end of the pivoted frame 10 moves upwardly or downwardly.

Pivotally mounted on the shaft 12 and extending forwardly is an axle engaging arm 13, which arm is maintained in a horizontal position at all times during a jacking operation. The axle engaging arm 13 isprovided with a rearwardly andupwardly extending arm 14,,to which is pivotallyconnected at 15 a rearwardly extending link16, the rear end of which is connected at '17 to the yoke 18, which yoke is pivotally connected at 19 to the side bars 2 of'the fixed frame 1. It will be seen that when the forward end of the pivoted frame 10 moves upwardly on the shaft 9 as a pivotal point, and as the pivotal points 19 are above the pivotal point of the pivoted frame, the link 16 will cooperate with the arm 14 wherebythc aide engaging member 13 will be maintained in a horizontal position at all times, and at the same time by this particular construction the axle en aging member 13 may assume a position relatively close to the ground so that it may be placed under the axle when relatively close to the ground, which is particularly advantageous in heavy motor bus construction whena tire is deflated, and at which time the axle housing is relatively close to the ground. i i

Secured to the inner faces of the side bars 2 of the fixed frame are plates 20, which plates are disposed between the side bars 2 and the side bars 11 of the pivoted frame 10.

Plates 2O incline downwardly and forwardly and are provided with downwardly and fol wardly inclined surfaces 21, adjacent the free end of the pivoted frame 10. The forward ends of the sidebars 11 of the pivoted frame 10 are provided with upwardly and forwardly extending inclined surfaces 22 adjacent the inclined surfaces 21 of the plates 20. Interposed between and adjacent the inclined surfaces21 and 22 are rollers 23, which rollers are rotatably mounted on the Pivotally mounted apertureddisc 29 and the ot ends of a transversely disposed head 24, and which head is moved forwardly and rearwardly by an operating rod 25, which moves axially, and it will be seen when the operatingrod 25 is moved in the direction of the arrow a, Figure 1, the rollers 23 will oooperate with the inclined surfaces 21 and i 22, and will force the free end of the pivoted frame Ulcupwalrdly, thereby raising the axle engaging member 13 and which axle engaging member will be maintained in a horizontal position by the link 16 which is a. connected to the arm 14. O'eratingrod 25 1 extends rearwardly and is slidably mounted at26 in a transversely disposed rockbar 27,

andis threaded through a rotatable member 28, which is provided with a disc 29having a plurahty of circumferentially arranged apertures 30 and a bearin disc 31 is interposed between the rotatab e member 28 and the rock bar 27, and is referably iformed from hard metal. It wilFbeseen when the rotatable member 28 is rotated in one direction ihc operating rod 25 will be moved in i the direction of the arrow a, thereby moving,

the rollers rearwardly for ralsmg the free end of the pivoted frame 10, and when rotated in the other direction the weight of the frame 10 and the load carried thereby,

in cooperation with the inclined surfaces 21 and 22 will force the rollers 23forwardly,

thereby lowering the forward end of the,

pivoted frame and the axle engaging mom-i ber 13.

Referring to Figures 2 and 7, wherein mechanism is shown for rotating the member 28,.this mechanism is substantiall as that shown in applicants prior atentNo. 1,559,099, issued October 27, 1925, and which patent shows a member equivalent to the member 28, and which comprises a transversely disposed shaft 32 connecting the rear the same a ends of the side bars 2 together, and on which shaft is rockably mounted a sleeve 33, a

and which sleeve has rockably mounted thereon the arms 34 carriedby the hollow handle member 35. The arms 34 extend forwardly of the sleeve33 and have pivotally 5 connected thereto at 36 upwardly extendin pawls 37 the noses 38 of which are adapts to be received in the a ertures 30 of thedisc 29 for rotating said either direction according to which pawl 37 is in operative position, and durin cillation of the handle member 35. awls 37 have pivotally connected thereto at 39 rods 40, which rods are slidably mounted in aperso and member 28 in EB OS- tnred cars 41 carried by the sleeve 33 and carried by the upper and lowersides of the sleeve, whereby upon rotation ofthe sleeve in one direction one of the moved into cooperative engagement with the pawls will be 1 er pawl. moved 1 out of cooperative engagement, and which operation is accomplished by one ofthe ears tively long whereby its rear. end will extend 41 compressing one of the springs 42 interposed between the ears and the pawls and the other ear cooperating with a pin 43 carried by the outer endsof the rods', therefore it will be seen that by rocking the sleeve 33, either pawl 37 can be forced into cooperative engagement with the apertured disc 29., and at opposite sides of the axis of the. disc, whereby upon an oscillation of the handle member 35 rotation can be imparted to the member 28 in either direction during a hoisting or lowering operation. Pivotally connected at 44 to an upwardly extending ear 45 carried by the sleeve 33 is a rearward- 1y extending flexible control rod 46, which control rod extends through the hollow handle 35 and terminates in a member 46 adja-' cent the handle members 47 whereit can be easily controlled bytheoperator during a' hoisting or lowering operation.

From the above it'will be seen a lifting,

jack is provided, which is particularlyv adapted for use in connection with relatively heavy motor busses wherein the axle housing is particularly'close to the ground, especially when a tire is deflated, and the jack is relarearwardly from an axle a substantial distance so the same maybe handled and ma 130 ing the free end of the/pivotedframe up} wardly, said means comprising an axially and pivotally movable operating rod carried by the fixed frame, and means carried by the operatin rod and cooperatin with opposed cam sur aces carried by the free end of the V pivoted frame and the fixed frame.

7 2. A lifting jack comprising a fixed frame having a rearwardly and upwardly inclined cam surface, a pivoted frame'having an up Wardly, and forwardly inclined surface adjacent the first mentioned inclined surface, and

i a rearwardly and forwardly movable mem ber carrier by the fixed frame and cooperating with the inclined surfaces and forming means whereby the free end of the pivoted frame may be forced upwardly or be allowed to move downwardly, said rearwardly and forwardly movable member being pivoted adjacent one of its ends and swingable in a vertical plane. Y

3. Avehiclejack comprising an elongated fixed. frame having side bars, a pivoted frame within the fixed frame and having side bars, cam surfaces carried by the inner sides of the side bars of the fixed frame, opposed cam surfaces carried by the side bars of the pivoted frame, an axle engaging member carried by the free endof the pivoted frame, a transversely disposed member,

rollers carried by the ends of the transversely disposed member and disposed between the fixed frame and the pivoted frame, a

pivoted rearwardly extending axially and vertically swingable operating rod connected to the transversely disposed member, and means cooperatingwith the operating rod whereby it may be axially moved.

In testimony whereof I afiix my signature.

ARTHUR o. HOPKINS.

' and in engagement with the cam surfaces of 

